Favoured by severe weather conditions during the rainy season and the large-scale circulation of air masses in the western Pacific, short-lived natural chlorinated and brominated compounds compounds may be able to reach the stratosphere, and thus have an impact on the ozone layer. Particularly strong sources of these compounds are thought to exist in the tropical western Pacific. But the role of these natural halogen compounds in ozone depletion is largely unexplored. Answers are expected from the European-Malaysian project SHIVA (Stratospheric ozone: Halogen Impacts in a Varying Atmosphere) in which the DLR Institute of Atmospheric Physics participates.

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